Nanostructure and Mechanical Properties of Polybutylacrylate Filled with Grafted Silica Particles

Inoubli, Rabi; Dagréou, Sylvie; Lapp, Alain; Billon, Laurent; Peyrelasse, J.

doi:10.1021/la0607003

Cited by 62 publications

(73 citation statements)

References 53 publications

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“…In the literature, one can find numerous references (Inoubli et al 2006;Shikata and Pearson 1994;van der Werff et al 1989;Graebling et al 1993;Watanabe et al 1996;VignauxNassiet et al 1998) on suspensions showing secondary relaxation processes which are similar to the one described in this paper. Watanabe et al (1997) discuss the frequency dependence of the storage and loss moduli G and G of spherical styrene-isoprene micelles randomly dispersed in a nonentangling homopolyisoprene matrix.…”

Section: Discussionsupporting

confidence: 72%

Strain-induced low-frequency relaxation in colloidal DGEBA/SiO2 suspensions

et al. 2014

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Diglycidyl ether of bisphenol A (DGEBA) is widely exploited as an epoxy resin in adhesives and coatings. In this paper, it is used as an oligomer matrix for silicafilled nanocomposites. Rheological measurements show that the pure matrix obeys power-law relaxation dynamics in the vicinity of the dynamic glass transition of this lowmolecular-weight glass former. In the filled systems, a lowfrequency relaxation appears additionally to the structural α-process of the matrix. Considering the nanocomposites as Newtonian hard-sphere suspensions at low angular frequencies (or high temperatures), the modified terminal regime behavior of the matrix can be linked to strain-induced perturbations of the isotropic filler distributions. While in the low-frequency regime hydrodynamic stresses relax instantaneously, the Brownian stress relaxation is viscoelastic and can be evidenced by dynamic rheological measurements. At higher angular frequencies, the α-process of the matrix superimposes on the Brownian stress relaxation. In particular, we were able to depict the low-frequency anomaly for concentrated, semi-dilute, and even for dilute suspensions.

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Section: Discussionsupporting

confidence: 72%

Strain-induced low-frequency relaxation in colloidal DGEBA/SiO2 suspensions

et al. 2014

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“…For the un-grafted system, this process would be provided by a "glassy layer" surrounding the filler [6,21,37], while for the grafted system it is given by contact between grafted layers [16,17,19,38]. These grafted layers could also be glassy, as mobility of grafted chains in the interface could be reduced [18].…”

Section: Discussionmentioning

confidence: 99%

“…Grafting polymer chains on the fillers can be used to control the internal organization in the composites and study the effect of the change in interfacial interactions on particles dispersion and mechanical properties of the nanocomposites. Recent results show that mechanical reinforcement is mainly based on the nanoparticles [15,16,17,18] (no matrix contribution), especially for individual particles dispersion in which solid-like behavior can be related to the direct contact between grafted brushes [19][20]. However, a general rule describing the mechanical behavior as a function of several particles dispersion, which can be individual, finite size aggregates (connected or not), or larger agglomerates, remains currently to be established.…”

Section: Introductionmentioning

confidence: 99%

Tuning the mechanical properties in model nanocomposites: Influence of the polymer‐filler interfacial interactions

Chevigny

Jouault

Dalmas

et al. 2011

J Polym Sci B Polym Phys

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This paper presents a study of the polymer-filler interfacial effects on filler dispersion and mechanical reinforcement in Polystyrene (PS) / silica nanocomposites by direct comparison of two model systems: un-grafted and PS-grafted silica dispersed in PS matrix. The structure of nanoparticles has been investigated by combining Small Angle Neutron Scattering (SANS) measurements and Transmission Electronic Microscopic (TEM) images. The mechanical properties were studied over a wide range of deformation by plate/plate rheology and uni-axial stretching. At low silica volume fraction, the particles arrange, for both systems, in small finite size non-connected aggregates and the materials exhibit a solid-like behavior independent of the local polymer/fillers interactions suggesting that reinforcement is dominated by additional long range effects. At high silica volume fraction, a continuous connected network is created leading to a fast increase of reinforcement whose amplitude is then directly dependent on the strength of the local particle/particle interactions and lower with grafting likely due to deformation of grafted polymer.

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“…Cassagnau [41] studied the viscoelastic properties of nanosilica-filled ethylene vinyl acetate copolymer (EVA, 60 wt% of vinyl acetate) in the molten state and diluted EVA/xylene solution, finding a liquid-solid transition at Φ c = 3.3 vol%, independently from the polymer chain regimes (entangled or Rouse regime). Inoubli et al [42] observed that 2.5 vol% of silica in polybutylacrylate nanocomposite was very close to the percolation threshold. Starting from these considerations, the objective of the present work is to investigate the linear viscoelastic behaviour of silica micro-and nanocomposites in the molten state, in order to find, at least from a qualitative point of view, a correlation between the filler characteristics (size and surface area) and the resulting dynamic rheological properties.…”

Section: Introductionmentioning

confidence: 95%

Linear low-density polyethylene/silica micro- and nanocomposites: dynamic rheological measurements and modelling

Dorigato¹,

Pegoretti²,

Penati³

2010

Express Polym. Lett.

106

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Abstract. Linear low-density polyethylene (LLDPE) based composites were prepared by melt compounding with 1, 2, 3 and 4 vol% of various kinds of amorphous silicon dioxide (SiO2) micro-and nanoparticles. Dynamic rheological tests in parallel plate configuration were conducted in order to detect the role of the filler morphology on the rheological behaviour of the resulting micro-and nanocomposites. A strong dependence of the rheological parameters from the filler surface area was highlighted, with a remarkable enhancement of the storage shear modulus (G′) and of the viscosity (η) in fumed silica nanocomposites and in precipitated silica microcomposites, while glass microbeads only marginally affected the rheological properties of the LLDPE matrix. This result was explained considering the formation of a network structure arising from particle-particle interactions due to hydrogen bonding between silanol groups. A detailed analysis of the solid like behaviour for the filled samples at low frequencies was conducted by fitting viscosity data with a new model, based on a modification of the original De Kee-Turcotte expression performed in order to reach a better modelling of the high-frequency region.

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Nanostructure and Mechanical Properties of Polybutylacrylate Filled with Grafted Silica Particles

Cited by 62 publications

References 53 publications

Strain-induced low-frequency relaxation in colloidal DGEBA/SiO2 suspensions

Strain-induced low-frequency relaxation in colloidal DGEBA/SiO2 suspensions

Tuning the mechanical properties in model nanocomposites: Influence of the polymer‐filler interfacial interactions

Linear low-density polyethylene/silica micro- and nanocomposites: dynamic rheological measurements and modelling

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